If you find yourself in a spot where you need to make last minute changes to a pdf document.Below are some options I stumbled upon:
How to edit a PDF?
Drag and drop your PDF into the online PDF editor. Use the preview to add text, images, shapes or draw on the PDF. Click "apply" and download your edited PDF. There is even a Google Drive and Dropbox option for file transfer.
This is similar to Smallpdf.com, but you can also create pdfs as well. There is also an option for larger size documents for $2.99/month
This is a very popular free image viewer and editor, but it also includes PDF editing functions. The software is open source, but the only downside (in my opinion) is that there is a lot of tools which might be over whelming at first.
If you know of any other good tools, comment below.